.leftBox {
    position: fixed;
    top: 100px;
    left: 0;
    height: calc(100vh - 100px);
    width: 250px;
    border-right: 1px solid red;
    box-sizing: border-box;
    display: flex;
    justify-content: space-around; 
}

.leftBox-div {
    width: 50px;
    height: 50px;
    border: 1px solid black;
    display: flex;
    justify-items: center;
    margin-top: 20px;
    cursor: move;
}

img {
    width: 100%;
}